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<div class="title">samples/cpp/intersectExample.cpp</div>  </div>
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<p>Examples of how intersectConvexConvex works</p>
<div class="fragment"><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> * Author: Steve Nicholson</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> * A program that illustrates intersectConvexConvex in various scenarios</span></div><div class="line"><span class="comment"> */</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d1/d4f/imgproc_2include_2opencv2_2imgproc_8hpp.html">opencv2/imgproc.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d4/dd5/highgui_8hpp.html">opencv2/highgui.hpp</a>&quot;</span></div><div class="line"></div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d2/d75/namespacecv.html">cv</a>;</div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d8/dcc/namespacestd.html">std</a>;</div><div class="line"></div><div class="line"><span class="comment">// Create a vector of points describing a rectangle with the given corners</span></div><div class="line"><span class="keyword">static</span> vector&lt;Point&gt; makeRectangle(<a name="_a0"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> topLeft, <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> bottomRight)</div><div class="line">{</div><div class="line">    vector&lt;Point&gt; <a name="a1"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga07d2f74cadcf8e305e810ce8eed13bc9">rectangle</a>;</div><div class="line">    rectangle.push_back(topLeft);</div><div class="line">    rectangle.push_back(<a name="a2"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(bottomRight.<a name="a3"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html#a4c96fa7bdbfe390be5ed356edb274ff3">x</a>, topLeft.<a name="a4"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html#a157337197338ff199e5df1a393022f15">y</a>));</div><div class="line">    rectangle.push_back(bottomRight);</div><div class="line">    rectangle.push_back(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(topLeft.<a class="code" href="../../db/d4e/classcv_1_1Point__.html#a4c96fa7bdbfe390be5ed356edb274ff3">x</a>, bottomRight.<a class="code" href="../../db/d4e/classcv_1_1Point__.html#a157337197338ff199e5df1a393022f15">y</a>));</div><div class="line">    <span class="keywordflow">return</span> <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga07d2f74cadcf8e305e810ce8eed13bc9">rectangle</a>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> vector&lt;Point&gt; makeTriangle(<a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> point1, <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> point2, <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> point3)</div><div class="line">{</div><div class="line">    vector&lt;Point&gt; <a name="a5"></a><a class="code" href="../../d9/db7/group__datasets__gr.html#gga610754124ced68d1f05760b5948fbb76a26c349619f95531945f6c0c7a24dedea">triangle</a>;</div><div class="line">    triangle.push_back(point1);</div><div class="line">    triangle.push_back(point2);</div><div class="line">    triangle.push_back(point3);</div><div class="line">    <span class="keywordflow">return</span> <a class="code" href="../../d9/db7/group__datasets__gr.html#gga610754124ced68d1f05760b5948fbb76a26c349619f95531945f6c0c7a24dedea">triangle</a>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">// Run intersectConvexConvex on two polygons then draw the polygons and their intersection (if there is one)</span></div><div class="line"><span class="comment">// Return the area of the intersection</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">float</span> drawIntersection(<a name="_a6"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> &amp;image, vector&lt;Point&gt; polygon1, vector&lt;Point&gt; polygon2, <span class="keywordtype">bool</span> handleNested = <span class="keyword">true</span>)</div><div class="line">{</div><div class="line">    vector&lt;Point&gt; intersectionPolygon;</div><div class="line"></div><div class="line">    vector&lt;vector&lt;Point&gt; &gt; polygons;</div><div class="line">    polygons.push_back(polygon1);</div><div class="line">    polygons.push_back(polygon2);</div><div class="line"></div><div class="line">    <span class="keywordtype">float</span> intersectArea = <a name="a7"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#ga8e840f3f3695613d32c052bec89e782c">intersectConvexConvex</a>(polygon1, polygon2, intersectionPolygon, handleNested);</div><div class="line"></div><div class="line">    <span class="keywordflow">if</span> (intersectArea &gt; 0)</div><div class="line">    {</div><div class="line">        <a name="_a8"></a><a class="code" href="../../d1/da0/classcv_1_1Scalar__.html">Scalar</a> fillColor(200, 200, 200);</div><div class="line">        <span class="comment">// If the input is invalid, draw the intersection in red</span></div><div class="line">        <span class="keywordflow">if</span> (!<a name="a9"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#ga8abf8010377b58cbc16db6734d92941b">isContourConvex</a>(polygon1) || !<a class="code" href="../../d3/dc0/group__imgproc__shape.html#ga8abf8010377b58cbc16db6734d92941b">isContourConvex</a>(polygon2))</div><div class="line">        {</div><div class="line">            fillColor = <a name="a10"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0, 0, 255);</div><div class="line">        }</div><div class="line">        <a name="a11"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga8c69b68fab5f25e2223b6496aa60dad5">fillPoly</a>(image, intersectionPolygon, fillColor);</div><div class="line">    }</div><div class="line">    <a name="a12"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga1ea127ffbbb7e0bfc4fd6fd2eb64263c">polylines</a>(image, polygons, <span class="keyword">true</span>, <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0, 0, 0));</div><div class="line"></div><div class="line">    <span class="keywordflow">return</span> intersectArea;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> drawDescription(<a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> &amp;image, <span class="keywordtype">int</span> intersectionArea, <span class="keywordtype">string</span> description, <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> origin)</div><div class="line">{</div><div class="line">    <span class="keyword">const</span> <span class="keywordtype">size_t</span> bufSize=1024;</div><div class="line">    <span class="keywordtype">char</span> caption[bufSize];</div><div class="line">    snprintf(caption, bufSize, <span class="stringliteral">&quot;Intersection area: %d%s&quot;</span>, intersectionArea, description.c_str());</div><div class="line">    <a name="a13"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga5126f47f883d730f633d74f07456c576">putText</a>(image, caption, origin, <a name="a14"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#gga0f9314ea6e35f99bb23f29567fc16e11afff8b973668df2e4028dddc5274310c9">FONT_HERSHEY_SIMPLEX</a>, 0.6, <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0, 0, 0));</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> intersectConvexExample()</div><div class="line">{</div><div class="line">    <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> image(610, 550, <a name="a15"></a><a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga88c4cd9de76f678f33928ef1e3f96047">CV_8UC3</a>, <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(255, 255, 255));</div><div class="line">    <span class="keywordtype">float</span> intersectionArea;</div><div class="line"></div><div class="line">    intersectionArea = drawIntersection(image,</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(10, 10), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(50, 50)),</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(20, 20), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(60, 60)));</div><div class="line"></div><div class="line">    drawDescription(image, (<span class="keywordtype">int</span>)intersectionArea, <span class="stringliteral">&quot;&quot;</span>, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(70, 40));</div><div class="line"></div><div class="line">    intersectionArea = drawIntersection(image,</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(10, 70), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(35, 95)),</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(35, 95), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(60, 120)));</div><div class="line"></div><div class="line">    drawDescription(image, (<span class="keywordtype">int</span>)intersectionArea, <span class="stringliteral">&quot;&quot;</span>, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(70, 100));</div><div class="line"></div><div class="line">    intersectionArea = drawIntersection(image,</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(10, 130), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(60, 180)),</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(20, 140), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(50, 170)),</div><div class="line">        <span class="keyword">true</span>);</div><div class="line"></div><div class="line">    drawDescription(image, (<span class="keywordtype">int</span>)intersectionArea, <span class="stringliteral">&quot; (handleNested true)&quot;</span>, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(70, 160));</div><div class="line"></div><div class="line">    intersectionArea = drawIntersection(image,</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(10, 190), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(60, 240)),</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(20, 200), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(50, 230)),</div><div class="line">        <span class="keyword">false</span>);</div><div class="line"></div><div class="line">    drawDescription(image, (<span class="keywordtype">int</span>)intersectionArea, <span class="stringliteral">&quot; (handleNested false)&quot;</span>, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(70, 220));</div><div class="line"></div><div class="line">    intersectionArea = drawIntersection(image,</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(10, 250), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(60, 300)),</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(20, 250), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(50, 290)),</div><div class="line">        <span class="keyword">true</span>);</div><div class="line"></div><div class="line">    drawDescription(image, (<span class="keywordtype">int</span>)intersectionArea, <span class="stringliteral">&quot; (handleNested true)&quot;</span>, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(70, 280));</div><div class="line"></div><div class="line">    <span class="comment">// These rectangles share an edge so handleNested can be false and an intersection is still found</span></div><div class="line">    intersectionArea = drawIntersection(image,</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(10, 310), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(60, 360)),</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(20, 310), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(50, 350)),</div><div class="line">        <span class="keyword">false</span>);</div><div class="line"></div><div class="line">    drawDescription(image, (<span class="keywordtype">int</span>)intersectionArea, <span class="stringliteral">&quot; (handleNested false)&quot;</span>, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(70, 340));</div><div class="line"></div><div class="line">    intersectionArea = drawIntersection(image,</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(10, 370), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(60, 420)),</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(20, 371), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(50, 410)),</div><div class="line">        <span class="keyword">false</span>);</div><div class="line"></div><div class="line">    drawDescription(image, (<span class="keywordtype">int</span>)intersectionArea, <span class="stringliteral">&quot; (handleNested false)&quot;</span>, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(70, 400));</div><div class="line"></div><div class="line">    <span class="comment">// A vertex of the triangle lies on an edge of the rectangle so handleNested can be false and an intersection is still found</span></div><div class="line">    intersectionArea = drawIntersection(image,</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(10, 430), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(60, 480)),</div><div class="line">        makeTriangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(35, 430), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(20, 470), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(50, 470)),</div><div class="line">        <span class="keyword">false</span>);</div><div class="line"></div><div class="line">    drawDescription(image, (<span class="keywordtype">int</span>)intersectionArea, <span class="stringliteral">&quot; (handleNested false)&quot;</span>, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(70, 460));</div><div class="line"></div><div class="line">    <span class="comment">// Show intersection of overlapping rectangle and triangle</span></div><div class="line">    intersectionArea = drawIntersection(image,</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(10, 490), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(40, 540)),</div><div class="line">        makeTriangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(25, 500), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(25, 530), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(60, 515)),</div><div class="line">        <span class="keyword">false</span>);</div><div class="line"></div><div class="line">    drawDescription(image, (<span class="keywordtype">int</span>)intersectionArea, <span class="stringliteral">&quot;&quot;</span>, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(70, 520));</div><div class="line"></div><div class="line">    <span class="comment">// This concave polygon is invalid input to intersectConvexConvex so it returns an invalid intersection</span></div><div class="line">    vector&lt;Point&gt; notConvex;</div><div class="line">    notConvex.push_back(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(25, 560));</div><div class="line">    notConvex.push_back(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(25, 590));</div><div class="line">    notConvex.push_back(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(45, 580));</div><div class="line">    notConvex.push_back(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(60, 600));</div><div class="line">    notConvex.push_back(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(60, 550));</div><div class="line">    notConvex.push_back(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(45, 570));</div><div class="line">    intersectionArea = drawIntersection(image,</div><div class="line">        makeRectangle(<a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(10, 550), <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(50, 600)),</div><div class="line">        notConvex,</div><div class="line">        <span class="keyword">false</span>);</div><div class="line"></div><div class="line">    drawDescription(image, (<span class="keywordtype">int</span>)intersectionArea, <span class="stringliteral">&quot; (invalid input: not convex)&quot;</span>, <a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(70, 580));</div><div class="line"></div><div class="line">    <a name="a16"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;Intersections&quot;</span>, image);</div><div class="line">    <a name="a17"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7">waitKey</a>(0);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main()</div><div class="line">{</div><div class="line">    intersectConvexExample();</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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